Structure-optimized anti-pollution polyamide composite membrane

A technology of polyamide and composite membrane, which is applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc. It can solve the problems of easy agglomeration, low desalination rate, and stability of exfoliated membranes, etc., to ensure selectivity, type Optimized effect

Active Publication Date: 2020-06-16
南京宏遥系统科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, titanium dioxide is called the most commonly used doped particle because of its low cost and easy acquisition. CN102886207 A patent document discloses that titanium dioxide is doped in the organic phase to form a polyamide film, but titanium dioxide is easy to agglomerate, and the addition of titanium dioxide destroys the The integrity and uniformity of the polyamide separation layer makes the desalination rate not high; the CN1401417 A patent document discloses that the prepared polyamide membrane is immersed in the titanium dioxide dispersion so that the titanium dioxide is doped on the membrane surface, but the titanium dioxide particles and the membrane layer The binding force is not enough, it is easy to fall off during the application process, which makes the film stability poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Mix 3wt% of m-phenylenediamine with water and stir uniformly to obtain an aqueous monomer I solution, and use sodium hydroxide to adjust the pH to 10; mix 2wt% of trimesoyl chloride with n-hexane and stir evenly Obtain the organic phase monomer I solution;

[0026] (2) Put the spare polysulfone support membrane into the aqueous monomer I solution and soak for 120 seconds, take it out and roll it with a rubber roller to remove the excess solution; after the solution is dry, contact the organic monomer I solution for 60 seconds. Form a polyamide separation layer within seconds, and place it in an oven to dry at 60°C;

[0027] (3) Mix 1wt% of m-phenylenediamine with water and stir uniformly to obtain an aqueous monomer II solution, and adjust the pH to 10 with sodium hydroxide; mix 0.5wt% of the trimesoyl chloride mixture, 0.2wt% Mix tetrabutyl titanate with n-hexane and stir to obtain the organic phase monomer II solution;

[0028] (4) Put the membrane prepared in step (2)...

Embodiment 2

[0031] (1) Mix 3wt% of m-phenylenediamine with water and stir uniformly to obtain an aqueous monomer I solution, and use sodium hydroxide to adjust the pH to 10; mix 2wt% of trimesoyl chloride with n-hexane and stir evenly Obtain the organic phase monomer I solution;

[0032] (2) Put the spare polysulfone support membrane into the aqueous monomer I solution and soak for 120 seconds, take it out and roll it with a rubber roller to remove the excess solution; after the solution is dry, contact the organic monomer I solution for 60 seconds. Form a polyamide separation layer within seconds, and place it in an oven to dry at 60°C;

[0033] (3) Mix 1wt% piperazine with water and stir uniformly to obtain an aqueous monomer II solution, and adjust the pH to 10 with sodium hydroxide; mix 0.5wt% isophthaloyl chloride and trimesoyl chloride mixture (Mass ratio 1:2), 0.2wt% of tetrabutyl titanate and n-hexane are mixed and stirred to obtain an organic phase monomer II solution;

[0034] (4) Pu...

Embodiment 3

[0037] (1) Mix 3wt% of m-phenylenediamine with water and stir uniformly to obtain an aqueous monomer I solution, and use sodium hydroxide to adjust the pH to 10; mix 2wt% of trimesoyl chloride with n-hexane and stir evenly Obtain the organic phase monomer I solution;

[0038] (2) Put the spare polysulfone support membrane into the aqueous monomer I solution and soak for 120 seconds, take it out and roll it with a rubber roller to remove the excess solution; after the solution is dry, contact the organic monomer I solution for 60 seconds. Form a polyamide separation layer within seconds, and place it in an oven to dry at 60°C;

[0039] (3) Mix 1wt% piperazine with water and stir uniformly to obtain an aqueous monomer II solution, and adjust the pH to 10 with sodium hydroxide; mix 0.5wt% isophthaloyl chloride and trimesoyl chloride mixture (Mass ratio 1:2), 0.2wt% of tetrabutyl titanate and n-hexane are mixed and stirred to obtain an organic phase monomer II solution;

[0040] (4) Pu...

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Abstract

The present invention provides a structure-optimized anti-pollution polyamide composite membrane comprising a porous support layer, a polyamide separation layer, and a polyamide functional layer in order. The polyamide functional layer contains titanium dioxide particles and has a more loose pore structure than the polyamide separation layer. The polyamide functional layer is obtained by contacting a water-phase monomer II with an organic-phase monomer II containing tetrabutyl titanate so as to simultaneously generate an interfacial polymerization process and a tetrabutyl titanate hydrolysis process, and the contact process is completed by standing for 10-20 seconds at the constant temperature of 40-60 DEG C. Compared with the prior art, the novel polyamide composite membrane provided by the invention has the advantages that the titanium dioxide is fixed on the surface of the polyamide separation layer by utilizing the loose polyamide functional layer, so that the stability of the titanium dioxide is ensured while the membrane flux is improved.

Description

Technical field [0001] The invention relates to a membrane, in particular to a polyamide composite membrane with anti-pollution ability. Background technique [0002] Membrane separation technology is known as a new technology with a strategic position in the process industry in the 21st century. It has been widely used in water resources, energy, ecological environment, traditional industrial transformation and other fields, in energy saving and consumption reduction, clean production and circular economy. Plays an important role. In membrane separation technology, membrane material is the key factor of membrane separation technology. [0003] Polyamide composite membrane is a common composite membrane material for seawater desalination and water treatment in this field. Compared with other membrane materials, polyamide composite membrane has a higher salt rejection rate and water flux, but the polyamide membrane material has anti-pollution ability Poorness limits its scope of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/02B01D71/34B01D71/42B01D71/56B01D71/68
CPCB01D61/027B01D67/0079B01D69/12B01D71/024B01D71/34B01D71/42B01D71/56B01D71/68
Inventor 徐小燕
Owner 南京宏遥系统科技有限公司
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